a, 556892 : 2 =278446

b, 50 + 20 + 11 + 22 + 33 =136

c, 22 + 44 + 55 + 66 + 88 = 275

d, 57 + 43 + 25 + 68 + 75 + 32 =300

\(5^5.\dfrac{1}{20}.2^2.3^3:125\)

\(=5^5.\dfrac{1}{2^2.5}.2^2.3^3:5^3\)

\(=\dfrac{2^2.3^3.5^5}{2^2.5^4}=3^3.5=27.5=135\)

= 3125 x 1/20 x 4 x 27 : 125

= 625/4 x 4 x 27 : 125

= 625 x 27 : 125

= 16875 : 125

= 135

ket qua la:

=495

=150

11+22+33+44+55+66+77+88+99

= ( 11 + 88 ) + ( 22 + 77 ) + ( 33 + 66 ) + ( 44 + 55 ) + 99

= 99 + 99 + 99 + 99 + 99

= 99 x 5 

= 495

10+20+30+40+50

= ( 10 + 40 ) + ( 20 + 30 ) + 50

= 50 + 50 + 50

= 50 x 3 

= 150

K mình nha mình nhanh nhất đó!

ai k mik mik ks lại

11+22+33+44+55+66+77+88+99

=(11+99)+(22+88)+(33+77)+(44+66)+55

=110+110+110+110+55

=110*4+55

=440+55

=495

10+20+30+40+50

=(10+50)+(20+40)+30

=60+60+30

=60*2+30

=120+30

=150

giúp mình nhé

bạn gửi số đt có thể gửi tin nhắn hình mình gửi chon được không

a) \(3^{22}< 3^{33}\)

b)\(16^{100}=2^{4.100}=2^{400}\)\(< 2^{500}\)

c)\(2^{91}>2^{55}\)

d)\(9^{20}=9^{10}.9^{10}\)

\(9999^{10}=9^{10}.1111^{10}\)

vì \(9^{10}=9^{10};9^{10}< 1111^{10}\Rightarrow9^{20}< 9999^2\)

a) \(x+5=20-\left(12-7\right)\)

\(\Rightarrow x+5=20-5\)

\(\Rightarrow x+5=15\)

\(\Rightarrow x=15-5\)

\(\Rightarrow x=10\)

b) \(15-\left(3+2x\right)=2^2\)

\(\Rightarrow3+2x=15-4\)

\(\Rightarrow3+2x=11\)

\(\Rightarrow2x=11-3\)

\(\Rightarrow2x=8\)

\(\Rightarrow x=\dfrac{8}{2}\)

\(\Rightarrow x=4\)

c) \(-11-\left(19-x\right)=50\)

\(\Rightarrow19-x=-11-50\)

\(\Rightarrow19-x=-61\)

\(\Rightarrow x=61+19\)

\(\Rightarrow x=80\)

d) \(159-\left(25-x\right)=43\)

\(\Rightarrow25-x=159-43\)

\(\Rightarrow25-x=116\)

\(\Rightarrow x=25-116\)

\(\Rightarrow x=-91\)

e) \(\left(79-x\right)-43=-\left(17-52\right)\)

\(\Rightarrow\left(79-x\right)-43=52-17\)

\(\Rightarrow79-x-43=35\)

\(\Rightarrow36-x=35\)

\(\Rightarrow x=1\)

f) \(\left(7+x\right)-\left(21-13\right)=32\)

\(\Rightarrow7+x-8=32\)

\(\Rightarrow x-1=32\)

\(\Rightarrow x=32+1\)

\(\Rightarrow x=33\)

g) \(-x+20=-15+8+13\)

\(\Rightarrow-x+20=6\)

\(\Rightarrow x=20-6\)

\(\Rightarrow x=14\)

h) \(-\left(-x+13-142\right)+18=55\)

\(\Rightarrow x-13+142+18=55\)

\(\Rightarrow x+147=55\)

\(\Rightarrow x=55-147\)

\(\Rightarrow x=-92\)

hoac sai vi tui moi lop 3

honh phai

11nhan11

22nhan22

33nhan33

co hong phai nhu the

* la dau nhan

: la dau cach giua cac phep thinh

= 500366 nha ban!

757530

11 + 11 = 22

22 + 22 = 44

33 + 33 = 66

44 + 44 = 88

55 + 55 = 110

Học tốt~

11+11=22

22+22=44

33+33=66

44+44=88

55+55=110

tk mk ha 

11+11=22

22+22=44

33+33=66

44+44=88

55+55=110